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Income (expense) from investments (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Income Expense From Investments [Abstract]  
Disclosure of detailed information about other gain loss from investments [text block]
Other gain (loss) from investments
(€ million)
 
2018
 
2017
 
2016
Dividends
 
 
231
 
 
 
205
 
 
 
143
 
Net gain (loss) on disposals
 
 
22
 
 
 
163
 
 
 
(14
)
Other net income (expense)
 
 
910
 
 
 
(33
)
 
 
(183
)
 
 
 
1,163
 
 
 
335
 
 
 
(54
)